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#include<iostream>
#include<vector>
using namespace std;        
 
template<class T>
int ExistIndex(const vector<T> v, T obj, int start = 0, int end = v.size() - 1)
{
	std::cout << "Start: " << start << std::endl;
	std::cout << "End: " << end << std::endl;
    return -1;
}
 
int main()
{
      //Executing
      vector<int> v1 = {1, 2, 3, 4};
      int l = ExistIndex(v1, 3);// Although this compiles
 
      cout << endl;
      return 0;
}

prog.cpp:6:67: error: local variable ‘v’ may not appear in this context
 int ExistIndex(const vector<T> v, T obj, int start = 0, int end = v.size() - 1)
                                                                   ^

Standard output is empty